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[ II Restrictions ]
[7] Water Pipe Installation
1. Schematic Piping Diagram and Piping System Components
indicates the direction of
the water flow.
6
Union joints/flange joints
1
Thermometer
2
Water pressure gauge
3
Valve
4
Flexible joint
5
Drain pipe
6
7
Pump
8
Air vent valve
Expansion tank
9
Water pipe
10
Drain valve
11
Strainer
12
Flow switch
13
HWE10060
City water
Heat pump unit
Water-side
2
heat
exchanger
T
1
T
1
2
12
Required to allow for a replacement of equipment.
Required to check the performance and monitor the operation of the units.
Recommended for checking the operation status.
Required to allow for a replacement or cleaning of the flow adjuster.
Recommended to prevent the noise and vibration from the pump from being transmitted.
Install the drain pipe with a downward inclination of between 1/100 and 1/200. To
prevent drain water from freezing in winter, install the drain pipe as steep an angle as
practically possible and minimize the straight line.
For cold climate installation, take an appropriate measure (e.g., drain heater) to prevent
the drain water from freezing.
Use a pump that is large enough to compensate for the total water pressure loss and
supply sufficient water to the unit.
Install air venting valves to the places where air can accumulate.
Automatic air vent valves (such as
Install an expansion tank to accommodate expanded water and to supply water.
Use pipes that allow for easy air purging, and provide adequate insulation.
Install drain valves so that water can be drained for servicing.
Install a strainer near the unit to keep foreign materials from entering the water-side
head exchanger (supplied).
Required to protect the unit.
9
1
1
Minimum upward
gradient of 1/200
3
13
8
4
P
P
4
3
5
4
7
11
4
4
1
1
Access hole cover
Air conditioning unit
1
') are effective.
8
- 24 -
Overflowed water
To drain outlet
8 '
5
P
4
3
5
Minimum upward
gradient of 1/200
To drain outlet
6
11
GB
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